ecostudyguide - Conservation Biology field that tries to...

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Conservation Biology – field that tries to protect biological disturbances Stochastic event pushes a species toward extinction Can include natural catastrophes, demographic changes, environmental changes, and genetic changes Glacial Valleys used as a model for the oxbow phenomenon (separated turn of a river) Destructive floods create the wetland complex in these glacial valleys Disconnected oxbows can be shallow, deep, partially connected, or dry and provide diverse habitats Mandering stream stream with many disconnections Lesson from that bushnature works on extremes – destructive forces are creative forces Sex more than ½ all life goes through non-sexual reproduction Hybridogenesis kick out all mate genes to make maternal clones and only use sperm to fertilize eggs (never get used) Arrhenotoky 1N male or 2N female Automixins mix chromosomes to get 100% maternal expression Amphimixis sex (produces the highest level of variation) Disadvantages of sex gonads are expensive organs to maintain; mating is risky and costly; only ½ of genetic material passed on Gamete size determines sex Evolution by natural selection 1)biodiversity; 2)extinction; 3)Adaptations Adaptations include physiological, morphological, and behavioral traits that enhance fitness Macroinvertebrates “the spineless majority” 95% of the animal kingdom Allochtonous input leaves fallinto river, get decomposed and supply water with nutrients Selective forces of the macroinvertebrates include: 1. Water (hydrology) – the physical presence of water STRATEGIES INCLUDE a. Torpor – quiescent state that resists dessication and can lie dormant for decades b. Metamorphosis c. Migration d. Rapid development 7-14 days e. Year long life cycle (death) f. Microhabitats 2. Oxygen – relatively low a. salt, altitude, and temperature drive O2 down b. depth, velocity, turbulence, wind and photosynthesis drive O2 up c. O2 moves 300k x slower through water Insect (spineless majority) adaptations for water
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1. Open tracheal a. air breathers b. plants c. air bubble(whirlygig d. plastrons – hairs that hold o2 2. closed tracheal a. cutaneous – diffusion b. pigments (red) hemoglobin binds to O2 c. gills Pats main themes 1. all species are always absent from almost everywhere 2. every adaptation is also a limitation these are so because the law of limits and law of tolerance law of limits performance of an individual/organism is limited by one key ingredient in
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This note was uploaded on 04/20/2008 for the course BIO 310 taught by Professor Patmagee! during the Spring '08 term at Western State Colorado University .

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ecostudyguide - Conservation Biology field that tries to...

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